100912081 has 2 divisors, whose sum is σ = 100912082. Its totient is φ = 100912080.

The previous prime is 100912073. The next prime is 100912103. The reversal of 100912081 is 180219001.

It is an a-pointer prime, because the next prime (100912103) can be obtained adding 100912081 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96353856 + 4558225 = 9816^2 + 2135^2 .

It is a cyclic number.

It is not a de Polignac number, because 100912081 - 2³ = 100912073 is a prime.

It is a super-2 number, since 2×100912081² = 20366496183501122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (100912001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50456040 + 50456041.

It is an arithmetic number, because the mean of its divisors is an integer number (50456041).

Almost surely, 2^100912081 is an apocalyptic number.

It is an amenable number.

100912081 is a deficient number, since it is larger than the sum of its proper divisors (1).

100912081 is an equidigital number, since it uses as much as digits as its factorization.

100912081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 100912081 is about 10045.5005350654. The cubic root of 100912081 is about 465.5657829652.

The spelling of 100912081 in words is "one hundred million, nine hundred twelve thousand, eighty-one".